Minerals of the chevkinite group in differentiated basic-ultrabasic intrusions from western slope of the Southern Urals

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Abstract

A detailed study of differentiated intrusions of the Misaelga complex located in the Taratash metamorphic block for the first time in the Urals revealed rare-earth mineralization represented by minerals of the chevkinite group. It has been established that during the process of crystallization differentiation at the final stages of the formation of the massif, the alkalinity and alumina content of the last portions of the melt increase, at which the formation of perrierite-(Ce) mineralization becomes possible in the temperature range from ~800 °C to ~1050 °C and partial pressure of oxygen lgfO2 = –12 .7.

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About the authors

S. G. Kovalev

Ufa Federal Research Centre RAS

Email: kovalev@ufaras.ru

Institute of Geology

Russian Federation, Ufa

S. S. Kovalev

Ufa Federal Research Centre RAS

Email: kovalev@ufaras.ru

Institute of Geology

Russian Federation, Ufa

A. A. Sharipova

Ufa Federal Research Centre RAS

Author for correspondence.
Email: kovalev@ufaras.ru

Institute of Geology

Russian Federation, Ufa

References

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Supplementary files

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2. Fig. 1. Structural scheme of the Urals (a), geological schemes of the Taratash complex (б) and the «Magnitny» site with rock bodies of the Misaelga complex (в). Megazones of the Urals: 1 — Cis-Urals; 2 — West Ural, 3 — Central Ural, 4 — Tagil, 5 — Magnitogorsk, 6 — East Ural; 7 — deposits of the Ai Formation (RF1); 8 — undivided Archean-Proterozoic deposits; 9 — tectonic zones with blastomylonites; 10 — uneven-aged mafic dikes; 11 — migmatites; 12 — garnet-biotite gneisses; 13 — layered bodies of the Misaelga.

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3. Fig. 2. Cross section and thin sections of rocks of the Misaelga Complex. 1 — olivine, 2 — clinopyroxene, 3 — orthopyroxene, 4 — plagioclase, 5 — ore minerals.

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4. Fig. 3. Micrographs of chevkinite group minerals in rocks of the Misaelga complex. chv — minerals of the chevkinite group, all — allanite, amf — amphibole, bi — biotite, ttn — titanite, mgt — magnetite, ilm — ilmenite, pl — plagioclase (oligoclase), q — quartz.

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5. Fig. 4. T–log fO2 diagram for intergrowths and exsolution microstructures of ilmenite and titanomagnetite from rocks of the Misaelga Complex. 1 — minerals of the gabbro horizon; 2 — minerals of the picrite horizon. HM and MW buffers after (Myers, Eugster, 1983), QFM buffer after (Berman, 1988), NNO buffer after (Huebner, Sato, 1970).

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